Vulnerability-Lookup

CVE-2026-69215 (GCVE-0-2026-69215)

Vulnerability from cvelistv5 – Published: 2026-09-15 19:17 – Updated: 2026-09-16 18:36

Title

Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin

Summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware uses unanchored substring checks instead of RFC 6265 domain and path matching when deciding whether to attach a stored cookie. A cookie for example.com can consequently be sent to an attacker-controlled hostname such as evilexample.com when an application using the same jar makes an attacker-influenced outbound request. This exposes session or authentication cookies and can enable hijacking of the application’s outbound sessions. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 18:18 UTC

CWE

CWE-565 - Reliance on Cookies without Validation and Integrity Checking
CWE-1275 - Sensitive Cookie with Improper SameSite Attribute

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/http4s/http4s/security/advisor…	x_refsource_CONFIRM
https://github.com/http4s/http4s/commit/c0a37f38d…	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v0.23.35	x_refsource_MISC
https://github.com/http4s/http4s/releases/tag/v1.…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
http4s	http4s	Affected: < 0.23.35 Affected: >= 1.0.0-M1, < 1.0.0-M47	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-69215

Vulnerability from fkie_nvd - Published: 2026-09-15 20:17 - Updated: 2026-09-16 20:39

Severity

6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/http4s/http4s/commit/c0a37f38d5ee2a568ba57bd9da62f8d79b8b1fcc
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v0.23.35
	security-advisories@github.com	https://github.com/http4s/http4s/releases/tag/v1.0.0-M47
	security-advisories@github.com	https://github.com/http4s/http4s/security/advisories/GHSA-grh8-3p95-f9rr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "http4s",
          "vendor": "http4s",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.23.35"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.0.0-M1, \u003c 1.0.0-M47"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
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      "lang": "en",
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    }
  ],
  "id": "CVE-2026-69215",
  "lastModified": "2026-09-16T20:39:16.610",
  "metrics": {
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        "cvssData": {
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          "baseScore": 6.8,
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GHSA-GRH8-3P95-F9RR

Vulnerability from github – Published: 2026-09-15 20:00 – Updated: 2026-09-15 20:00

Summary

Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin

Details

The CookieJar client middleware decides whether to attach a cookie to an outgoing request using an unanchored substring test on the host and path, instead of the domain match specified by RFC6265 5.1.3. A cookie stored for example.com is therefore sent to any host whose name merely contains example.com (e.g. evilexample.com), leaking potentially sensitive cookies to an attacker-chosen host.

Impact

Disclosure of session and authentication cookies to an attacker-controlled host, enabling session hijack of the application's outbound calls.

Preconditions

Application uses the CookieJar client middleware.
Application can be induced to make an outbound request to a host controlled by the attacker, where the hostname contains the targeted domain as a substring.

Workarounds

Do not use the CookieJar with clients that fetch attacker-influenced URLs
Apply a separate CookieJar per trusted origin.

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
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      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.23.34"
      },
      "package": {
        "ecosystem": "Maven",
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      },
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      },
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            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69215"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1275",
      "CWE-565"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-15T20:00:54Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "The `CookieJar` client middleware decides whether to attach a cookie to an outgoing request using an unanchored substring test on the host and path, instead of the domain match specified by RFC6265 5.1.3.  A cookie stored for `example.com` is therefore sent to any host whose name merely contains `example.com` (e.g. `evilexample.com`), leaking potentially sensitive cookies to an attacker-chosen host.\n\n## Impact\n\nDisclosure of session and authentication cookies to an attacker-controlled host, enabling session hijack of the application\u0027s outbound calls.\n\n## Preconditions\n\n- Application uses the `CookieJar` client middleware.\n- Application can be induced to make an outbound request to a host controlled by the attacker, where the hostname contains the targeted domain as a substring.\n\n## Workarounds\n\n- Do not use the `CookieJar` with clients that fetch attacker-influenced URLs\n- Apply a separate `CookieJar` per trusted origin.",
  "id": "GHSA-grh8-3p95-f9rr",
  "modified": "2026-09-15T20:00:54Z",
  "published": "2026-09-15T20:00:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-grh8-3p95-f9rr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/commit/c0a37f38d5ee2a568ba57bd9da62f8d79b8b1fcc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/http4s/http4s"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v0.23.35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-69215 (GCVE-0-2026-69215)

FKIE_CVE-2026-69215

GHSA-GRH8-3P95-F9RR

Impact

Preconditions

Workarounds

Tags

Sightings

Nomenclature

Related by attack behaviour